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A better understanding of the fundamental interactions is a key to physicists' search for a new, underlying theory of the physical world. One starting point is to investigate the microscopic description of forces: electromagnetism, gravity, and the two nuclear forces, strong and weak, with increasingly energetic collisions. The Large Hadron Collider at CERN has not only the highest energy yet achieved in a particle accelerator, but also the highest luminosity—with events measured in millions of collisions per second. This presents a challenge for physicists to capture only the most interesting events and to find reliable ways to analyze these to reveal interactions that have never been seen before.